SimpleXML 能否仅加载部分 XML? [英] Can SimpleXML load only a partial of a XML?

问题描述

有没有办法不加载整个提要而只加载前 10 个 <item></item> 标签?

Is there a way not to load the whole feed but only the first 10 <item></item> tag?

$feed = 'rss file';
$xml = simplexml_load_file($feed); //not the entire feed though

推荐答案

没有.DOM 解析器(例如 SimpleXML)只能加载整个文档.

No. A DOM parser (such as SimpleXML) can only load the entire document.

但是你可以使用XPath来过滤相关部分:

But you can use XPath to filter the relevant parts:

$xml   = simplexml_load_file($feed);
$top10 = $xml->xpath('/rss/channel/item[position() <= 10]');

foreach($top10 as $item) {
   // output $item;
}

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